US4823398A - Diversity receiver - Google Patents
Diversity receiver Download PDFInfo
- Publication number
- US4823398A US4823398A US06/944,546 US94454686A US4823398A US 4823398 A US4823398 A US 4823398A US 94454686 A US94454686 A US 94454686A US 4823398 A US4823398 A US 4823398A
- Authority
- US
- United States
- Prior art keywords
- electric field
- receiver
- switch
- output
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
- H04B1/1615—Switching on; Switching off, e.g. remotely
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a diversity receiver and, more particularly, to a diversity receiver which has two radio receivers and performs selective switching between demodulated outputs from the two radio receivers.
- a selection diversity-type receiver has two radio receivers (referred to as "receivers" hereinafter), each of such receivers having an antenna and amplifier.
- the receiver demodulates an input signal received by its antenna in order to output a demodulated signal when it is supplied with power (i.e., is switched ON) and generates an electric field intensity output in accordance with the intensity of the electric field.
- the selection diversity-type receiver compares the electric field detection outputs from the two receivers while the two receivers are constantly ON, and performs switching in order to select a demodulated output from a receiver having a higher electric field detection output.
- any of a plurality of antennas is connected to a single receiver.
- the quality of communication of the selected antenna is degraded below a predetermined value, it is switched to another antenna, thereby restoring predetermined quality of communication. Since only a single receiver is provided, power consumption is small. However, quality of communication is not so improved much as in the selection diversity-type receiver.
- the diversity receiver comprises: first and second receivers having receiver antennas and generating demodulated signals and electric field detection outputs in accordance with received electric fields, respectively; a first switch for switching between the demodulated signals from the first and second receivers in accordance with an output switching control signal and outputting a selected one of the demodulated signals; comparing means for comparing the electric field detection outputs from the first and second receivers, respectively, and supplying the output switching control signal to the first switch in accordance with the result of the comparison; a second switch for turning on/off a power supply source of the first receiver in accordance with a power source switching control signal; and a controller for receiving the electric field detection output from the second receiver, averaging intensity of the received electric field, and supplying the power source switching control signal to the second switch in accordance with the average intensity of the electric field.
- FIG. 1 is a block diagram of an embodiment of the present invention
- FIG. 2 is a circuit diagram of an example of a controller shown in FIG. 1;
- FIG. 3 is a block diagram of another embodiment of the present invention.
- FIG. 4 is a circuit diagram of an example of a controller shown in FIG. 3;
- FIG. 5 is a block diagram of still another embodiment of the present invention.
- FIG. 6 is a graph wherein the quality of communication in the embodiment shown in FIG. 5 is compared with that of a conventional receiver;
- FIG. 7 is a graph wherein the power consumption of the embodiment shown in FIG. 5 is compared with that of the conventional receiver.
- FIG. 8 is a flow chart showing the function of the controller in FIGS. 1 and 2;
- FIG. 1 is a block diagram of a selection diversity type receiver according to an embodiment of the present invention.
- reference numerals 1 and 2 denote antennas; 3 and 4, receivers; 5, a comparator; 6 and 7, switches; 8, a controller; 9, a low frequency amplifier; and 10, a loudspeaker.
- the signals received by the antennas 1 and 2 are amplified and demodulated by the receivers 3 and 4, respectively.
- Electric field detection outputs V1 and V2 generated by the receivers 3 and 4 are compared with each other by the comparator 5, and the switch 6 is switched so that the demodulated output of the receiver whose electric field detection output voltage is higher than the other is selected.
- the demodulated output selected by the switch 6 is amplified by the low frequency amplifier 9 and output from the loudspeaker 10.
- FIG. 8 is a flowchart showing the function of the controller 8;
- the controller 8 averages the voltages of the electric field detection output V2 to obtain an average electric field detection output voltage (S1), and compares it with a predetermined reference voltage (S2).
- the controller 8 generates a control signal to turn off the switch 7 when the average electric field detection output voltage is higher than the reference voltage (S3), and to turn on the switch 7 when the average electric field detection output voltage is lower than or equal to the reference voltage (S4).
- the switch 7 is turned on, diversity signal reception is performed.
- the switch 7 is turned off, the electric field detection output V1 of the receiver 3 becomes 0 and the comparator 4 constantly selects the demodulated signal from the receiver 4.
- FIG. 2 is a circuit diagram showing in detail an example of the controller 8.
- the electric field detection output V2 When the electric field detection output V2 is supplied from the receiver 4 to the controller 8, it is integrated by a low pass filter 11 to obtain an average electric field detection output voltage Va which is input to the inverting input terminal of a comparator 12.
- the non-inverting input terminal of the comparator 12 receives a reference voltage Vr obtained by dividing a power source voltage Vcc by resistors 13 and 14.
- the comparator 12 outputs a signal of high level "H” and turns on the switch 7.
- the comparator 12 When the average electric field detection output voltage Va is larger than the reference voltage Vr, the comparator 12 outputs a signal of low level "L” and turns off the switch 7.
- the power source for the first receiver is turned off and reception is performed only by the second receiver. Therefore, the power consumption is reduced.
- FIG. 3 is a block diagram of a diversity receiver according to another embodiment of the present invention.
- outputs V1 and V2 from receivers 3 and 4 are supplied to a controller 8'.
- a power source voltage Vcc for the receiver 4 is supplied through a switch 11 which is controlled by the controller 8'.
- the signals received by the antennas 1 and 2 are amplified and demodulated by the receivers 3 and 4, respectively.
- Electric field detection outputs V1 and V2 generated by the receivers 3 and 4 are compared with each other by a comparator 5, and a switch 6 is switched so that the demodulated output of the receiver whose electric field detection output voltage is higher than the other is selected.
- the demodulated output selected by the switch 6 is amplified by a low frequency amplifier 9 and output from a loudspeaker 10.
- the electric field detection outputs V1 and V2 from the receivers 3 and 4 are supplied to the controller 8'.
- the controller 8' averages the voltages of the electric field detection outputs V1 and V2 to obtain average electric field detection outputs V1 and V2, respectively, and compares them with a preset reference voltage Vr.
- FIG. 4 shows an example of the controller 8' for practicing the above operation.
- reference numerals 21 and 22 denote low pass filters; 23, 24, and 25, comparators; 26, an inverter; 27, a NOR gate; 28, an exclusive OR gate; 29 to 33, AND gates; and 34 and 35, OR gates.
- the outputs from the low pass filters 21 and 22 respectively correspond to V1 and V2 obtained by averaging their input voltages V1 and V2 over time.
- the comparators 23, 24, and 25 respectively compare V1 with the reference voltage Vr, V1 with V2, and V2 with Vr.
- the outputs from the comparators 23 and 25 are respectively at level “L” and the output from the comparator 24 is at level “L” or “H”. Therefore, the outputs from the NOR gate 27, the exclusive OR gate 28, and the AND gate 29 are respectively at levels “H”, “L”, and “L”, and the output from the inverter 26 is at level “H” or “L”. Therefore, the outputs from the AND gates 30, 31, 32, and 33 are at level “L”, and the outputs from the OR gates 34 and 35 are at level "H”. Thus, the switches SW7 and SW11 are turned on, thus enabling diversity reception.
- the outputs from the comparators 23 and 25 are at level “H", and the output from the comparator 24 is at level “H” (if V1 >V2) or at level “L” (if V1 ⁇ V2). Therefore, the output from the inverter 26 is at level “L” or “H”, and the outputs from the NOR gate 27, the exclusive OR gate 28, and the AND gate 29 are respectively at levels “L", "L", and "H”. Thus, the outputs from the AND gates 30, 31, 32, and 33 are respectively at “L”, “L”, “H” or "L”, and "L” or “H”.
- the output from the OR gate 34 is at level “H” if V1 >V2 and is at "L” if V1 ⁇ V2, and the output from the OR gate 35 is at level “L” if V1 >V2 and is at "H” if V1 ⁇ V2. Therefore, if V1 >V 2, the switches SW7 and SW11 are respectively turned on and off, and only the first receiver is enabled. If V1 ⁇ V2, the switches SW7 and SW11 are respective turned off and on, and only the second receiver is enabled.
- FIG. 5 is a block diagram of still another embodiment of the present invention.
- Either an antenna 51 or 52 is connected to a receiver 53 through a switch 57.
- the antenna 52 and a receiver 54 are connected to each other through a switch 58.
- a demodulated output from either the receiver 53 or 54 is connected to a base band unit 61 through a switch 59.
- a controller 55 receives received electric field detection outputs V1 and V2 from the receivers 53 and 54, respectively, and calculates an average electric field intensity within a predetermined period of time.
- the controller 55 controls switches 57, 58, 59, and 60 through control lines 57', 58', 59', and 60' in order to perform an antenna switching diversity operation when the average intensity of the electric field is higher than a predetermined value, and to perform a selective diversity operation when the average intensity of the electric field is lower than the predetermined value.
- the switch 58 is turned off, the switch 59 connects the receiver 53 with the base band unit 61, and the switch 60 disconnects a power source 56 and the receiver 54.
- the switch 57 is controlled to switch to another antenna.
- the switch 57 connects the antenna 51 with the receiver 53, the switch 58 connects the antenna 52 with the receiver 54, and the switch 60 is turned on.
- the controller 55 controls the switch 59 so that a larger received electric field detection output of the two outputs from the receivers 3 and 4 is connected to the base band unit 61.
- FIG. 6 is a graph showing the relationship between the intensity of the electric field and the quality of communication in the present invention in comparison with that in the case of a conventional technique.
- broken lines A, B, and C indicate the cases of selective diversity, antenna switching diversity, and reception without diversity, respectively
- a solid line D indicates the case of the present invention.
- reference symbol a indicates an average intensity of electric field for switching between antenna switching and selective diversity operations.
- FIG. 6 generally when the intensity of electric field is low, degradation in quality of communication is considerable.
- both antenna switching and selective diversity operations are employed, even if the intensity of the electric field is low, a higher quality of communication can be maintained compared with a case of an antenna switching diversity receiver.
- FIG. 7 is a graph showing the relationship between the intensity of the electric field and the power consumption in the present invention in comparison with that in the case of the conventional technique.
- broken lines E and F indicate cases of selective and antenna switching diversity operations, respectively, and a solid line E indicates the case of the present invention.
- the power consumption can be decreased below that of a selective diversity receiver.
Abstract
Description
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60-289832 | 1985-12-23 | ||
JP28983285 | 1985-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4823398A true US4823398A (en) | 1989-04-18 |
Family
ID=17748345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/944,546 Expired - Lifetime US4823398A (en) | 1985-12-23 | 1986-12-19 | Diversity receiver |
Country Status (8)
Country | Link |
---|---|
US (1) | US4823398A (en) |
EP (1) | EP0227458B1 (en) |
JP (1) | JPS62230125A (en) |
AU (1) | AU589859B2 (en) |
CA (1) | CA1281079C (en) |
DE (1) | DE3684769D1 (en) |
HK (1) | HK30493A (en) |
SG (1) | SG128392G (en) |
Cited By (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5065449A (en) * | 1987-08-03 | 1991-11-12 | Orion Industries | Booster diversity receiving system usable with cellular booster |
US5119501A (en) * | 1990-04-19 | 1992-06-02 | Ericsson Ge Mobile Communications, Inc. | Adaptive diversity equipment arrangement for cellular mobile telephone systems |
US5134486A (en) * | 1990-07-27 | 1992-07-28 | Sony Corporation | Television set with satellite broadcast receiver |
US5157672A (en) * | 1989-03-15 | 1992-10-20 | Nec Corporation | Interference detection apparatus for use in digital mobile communications system |
US5168574A (en) * | 1987-08-03 | 1992-12-01 | Orion Industries, Inc. | System and method for switching between antennas in a radio frequency booster |
US5193212A (en) * | 1989-05-31 | 1993-03-09 | Samsung Electronics Co., Ltd. | Circuit for saving battery for use in a radio paging receiver and method thereof |
GB2262863A (en) * | 1991-12-23 | 1993-06-30 | Motorola Ltd | Radio communications apparatus with diversity |
US5230077A (en) * | 1989-08-25 | 1993-07-20 | Telefonaktiebolaget L M Ericsson | Method of reducing the power requirements in a mobile radio receiver |
US5263175A (en) * | 1990-09-28 | 1993-11-16 | Motorola, Inc. | Diversity repeater diagnostic method and apparatus |
AU656398B2 (en) * | 1991-08-28 | 1995-02-02 | Nec Corporation | Power saving diversity receiver |
WO1995008223A1 (en) * | 1993-09-15 | 1995-03-23 | Nokia Telecommunications Oy | Method for monitoring a radio receiver unit |
WO1995011552A1 (en) * | 1993-10-21 | 1995-04-27 | Nokia Telecommunications Oy | Antenna switching diversity receiver |
US5535440A (en) * | 1990-10-11 | 1996-07-09 | Clappier; Robert R. | FM receiver anti-fading method and system |
US5566364A (en) * | 1994-01-31 | 1996-10-15 | Nec Corporation | Power saving portable radio communication device with diversity reception |
US5615411A (en) * | 1994-04-22 | 1997-03-25 | Rockwell International | Method and apparatus for composite signal separation and FM demodulation |
US5648992A (en) * | 1993-09-30 | 1997-07-15 | Rockwell Semiconductor Systems, Inc. | Multiple antenna home base for digital cordless telephones |
US5724649A (en) * | 1994-06-29 | 1998-03-03 | Atral | Voltage regulation circuit for a radio with plural receivers |
US5797090A (en) * | 1995-12-07 | 1998-08-18 | Nec Corporation | Radio receiving apparatus having current consumption reducing function |
US5805989A (en) * | 1994-10-05 | 1998-09-08 | Mitsubishi Denki Kabushiki Kaisha | Radio communication apparatus |
US6055422A (en) * | 1996-04-23 | 2000-04-25 | Nec Corporation | Radio apparatus with diversity antennas |
US6079367A (en) * | 1997-10-10 | 2000-06-27 | Dogwatch, Inc. | Animal training apparatus and method |
DE19905158A1 (en) * | 1999-02-08 | 2000-08-24 | Becker Gmbh | Radio receiver using frequency diversity for optimizing reception characteristics has multi-path detector that initiates control signal for selecting new antenna/tuner combination |
WO2000051089A1 (en) * | 1999-02-25 | 2000-08-31 | Pittway Corp. | Wireless communication system with increased dynamic range |
WO2001005088A1 (en) * | 1999-07-07 | 2001-01-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Controlled antenna diversity |
US6473601B1 (en) * | 1998-08-28 | 2002-10-29 | Nec Corporation | Reception diversity control method and diversity receiver |
US6672939B2 (en) | 1997-10-06 | 2004-01-06 | Nec Laboratories America, Inc. | Cost-effective side-coupling polymer fiber optics for optical interconnections |
US6757267B1 (en) * | 1998-04-22 | 2004-06-29 | Koninklijke Philips Electronics N.V. | Antenna diversity system |
US20040136406A1 (en) * | 2003-01-14 | 2004-07-15 | Shigeyuki Kuramoto | Simultaneous broadcasting receiver |
US6839563B1 (en) * | 1998-02-11 | 2005-01-04 | Renishaw, Plc | Signal transmission circuit for probe |
US20050197080A1 (en) * | 2004-03-05 | 2005-09-08 | Fatih Ulupinar | Method and apparatus for receive diversity control in wireless communications |
US20050197079A1 (en) * | 2004-03-05 | 2005-09-08 | Banister Brian C. | Multi-antenna receive diversity control in wireless communications |
US20060142044A1 (en) * | 2004-12-29 | 2006-06-29 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling power in mobile terminal having diversity receiver |
US20070129020A1 (en) * | 2004-11-15 | 2007-06-07 | Karl Anton-Becker | Radio system |
US20080051046A1 (en) * | 2006-08-25 | 2008-02-28 | Reinhard Ruckriem | Diversity receiver |
US20090109001A1 (en) * | 2007-10-31 | 2009-04-30 | Hitachi, Ltd. | Wireless IC tag, wireless IC tag system and operation method for wireless IC tag |
US20120302191A1 (en) * | 2011-05-24 | 2012-11-29 | Continental Automotive Systems Us, Inc. | Receiver with antenna switching capability |
CN102918707A (en) * | 2010-06-11 | 2013-02-06 | 瑞典爱立信有限公司 | A node in a communication system with switchable antenna functions |
CN103414507A (en) * | 2013-07-26 | 2013-11-27 | 北京小米科技有限责任公司 | Mobile terminal and method and device for switching antennas of mobile terminal |
CN104717668A (en) * | 2013-12-16 | 2015-06-17 | 展讯通信(上海)有限公司 | System and method used for improving mobile terminal antenna directionality |
CN106099397A (en) * | 2016-08-18 | 2016-11-09 | 常熟市泓博通讯技术股份有限公司 | There is the electronic installation of multiple antennas |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0480144U (en) * | 1990-11-26 | 1992-07-13 | ||
GB9107919D0 (en) * | 1991-04-15 | 1991-05-29 | Gen Electric Co Plc | Radio receiver systems |
JPH07254871A (en) * | 1994-01-31 | 1995-10-03 | Nec Corp | Portable radio communication equipment |
DE19905157B4 (en) * | 1999-02-08 | 2006-06-29 | Harman Becker Automotive Systems (Becker Division) Gmbh | Radio receiver |
US6778815B1 (en) * | 1999-11-24 | 2004-08-17 | Kabushiki Kaisha Toshiba | Mobile radio terminal apparatus |
CN101388971A (en) * | 2007-09-13 | 2009-03-18 | 深圳Tcl新技术有限公司 | Method and apparatus providing preference channel |
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JPH0666722B2 (en) * | 1983-09-01 | 1994-08-24 | 日本電信電話株式会社 | Diversity reception method in mobile station |
JPS60100840A (en) * | 1983-11-07 | 1985-06-04 | Nippon Telegr & Teleph Corp <Ntt> | Diversity receiver for portable radio equipment |
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JPS61284125A (en) * | 1985-06-11 | 1986-12-15 | Nec Corp | Diversity reception system |
-
1986
- 1986-12-19 US US06/944,546 patent/US4823398A/en not_active Expired - Lifetime
- 1986-12-22 EP EP86309993A patent/EP0227458B1/en not_active Expired - Lifetime
- 1986-12-22 DE DE8686309993T patent/DE3684769D1/en not_active Expired - Fee Related
- 1986-12-22 CA CA000525989A patent/CA1281079C/en not_active Expired - Fee Related
- 1986-12-23 JP JP61305519A patent/JPS62230125A/en active Pending
- 1986-12-23 AU AU66914/86A patent/AU589859B2/en not_active Ceased
-
1992
- 1992-12-17 SG SG1283/92A patent/SG128392G/en unknown
-
1993
- 1993-03-25 HK HK304/93A patent/HK30493A/en not_active IP Right Cessation
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US4035728A (en) * | 1975-01-09 | 1977-07-12 | Nippon Electric Company, Ltd. | Diversity receiving system |
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Cited By (69)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5168574A (en) * | 1987-08-03 | 1992-12-01 | Orion Industries, Inc. | System and method for switching between antennas in a radio frequency booster |
US5065449A (en) * | 1987-08-03 | 1991-11-12 | Orion Industries | Booster diversity receiving system usable with cellular booster |
US5157672A (en) * | 1989-03-15 | 1992-10-20 | Nec Corporation | Interference detection apparatus for use in digital mobile communications system |
US5193212A (en) * | 1989-05-31 | 1993-03-09 | Samsung Electronics Co., Ltd. | Circuit for saving battery for use in a radio paging receiver and method thereof |
US5230077A (en) * | 1989-08-25 | 1993-07-20 | Telefonaktiebolaget L M Ericsson | Method of reducing the power requirements in a mobile radio receiver |
US5119501A (en) * | 1990-04-19 | 1992-06-02 | Ericsson Ge Mobile Communications, Inc. | Adaptive diversity equipment arrangement for cellular mobile telephone systems |
US5134486A (en) * | 1990-07-27 | 1992-07-28 | Sony Corporation | Television set with satellite broadcast receiver |
US5263175A (en) * | 1990-09-28 | 1993-11-16 | Motorola, Inc. | Diversity repeater diagnostic method and apparatus |
US5535440A (en) * | 1990-10-11 | 1996-07-09 | Clappier; Robert R. | FM receiver anti-fading method and system |
AU656398B2 (en) * | 1991-08-28 | 1995-02-02 | Nec Corporation | Power saving diversity receiver |
US5390357A (en) * | 1991-08-28 | 1995-02-14 | Nec Corporation | Power saving diversity receiver |
GB2262863A (en) * | 1991-12-23 | 1993-06-30 | Motorola Ltd | Radio communications apparatus with diversity |
GB2262863B (en) * | 1991-12-23 | 1995-06-21 | Motorola Ltd | Radio communications apparatus with diversity |
WO1995008223A1 (en) * | 1993-09-15 | 1995-03-23 | Nokia Telecommunications Oy | Method for monitoring a radio receiver unit |
CN1067820C (en) * | 1993-09-15 | 2001-06-27 | 诺基亚电信公司 | Method for monitoring a radio receiver unit |
US5752165A (en) * | 1993-09-15 | 1998-05-12 | Nokia Telecommunications Oy | Method and apparatus for comparing averages of signal levels of receivers of receiver unit for automatically providing indication of a defective receiver |
US5661762A (en) * | 1993-09-30 | 1997-08-26 | Rockwell Semiconductor Systems, Inc. | Multiple antenna home base for digital cordless telephones |
US5696798A (en) * | 1993-09-30 | 1997-12-09 | Rockwell Semiconductor Systems, Inc. | Multiple antenna home base for digital cordless telephones |
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Also Published As
Publication number | Publication date |
---|---|
EP0227458A2 (en) | 1987-07-01 |
EP0227458A3 (en) | 1988-10-19 |
JPS62230125A (en) | 1987-10-08 |
EP0227458B1 (en) | 1992-04-08 |
HK30493A (en) | 1993-04-02 |
CA1281079C (en) | 1991-03-05 |
DE3684769D1 (en) | 1992-05-14 |
SG128392G (en) | 1993-03-12 |
AU6691486A (en) | 1987-06-25 |
AU589859B2 (en) | 1989-10-19 |
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